diff --git a/src/Message/OldCompletePurchaseResponse.php b/src/Message/OldCompletePurchaseResponse.php
index 548e7d7..d06b6b7 100644
--- a/src/Message/OldCompletePurchaseResponse.php
+++ b/src/Message/OldCompletePurchaseResponse.php
@@ -34,7 +34,7 @@ public function getCheckoutId()
      */
     public function getTransactionId()
     {
-        return $this->data['ik_trans_id'];
+        return $this->data['ik_payment_id'];
     }
 
     /**
@@ -42,7 +42,7 @@ public function getTransactionId()
      */
     public function getTransactionReference()
     {
-        return $this->data['ik_payment_id'];
+        return $this->data['ik_trans_id'];
     }
 
     /**